{"id":22656,"date":"2026-09-28T09:21:19","date_gmt":"2026-09-28T09:21:19","guid":{"rendered":"https:\/\/www.tarluz.com\/?p=22656"},"modified":"2026-09-28T09:24:35","modified_gmt":"2026-09-28T09:24:35","slug":"1-6t-osfp224-dac-finned-top-vs-rhs","status":"publish","type":"post","link":"https:\/\/www.tarluz.com\/de\/1-6t\/1-6t-osfp224-dac-finned-top-vs-rhs\/","title":{"rendered":"1.6T OSFP224 DAC: Finned Top vs. RHS"},"content":{"rendered":"

TL;DR:<\/span><\/strong> The 1.6T OSFP224 DAC is available in both Finned Top (IHS) and RHS (Riding Heat Sink) designs, with full interoperability between the two. Whether your rack uses air-cooled switches, liquid-cooled AI servers, or a mix of both, one DAC product line covers every thermal scenario\u2014reducing SKU complexity and simplifying inventory management across heterogeneous infrastructure.<\/span><\/p>\n

Understanding the Two Thermal Form Factors<\/span><\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n
Feature<\/span><\/th>\nFinned Top (IHS)<\/span><\/th>\nRHS (Riding Heat Sink)<\/span><\/th>\n<\/tr>\n<\/thead>\n
Cooling Fins<\/span><\/strong><\/td>\nIntegrated into module connector top<\/span><\/td>\nNone on module; fins ride on host cage<\/span><\/td>\n<\/tr>\n
Module Height<\/span><\/strong><\/td>\n~13 mm<\/span><\/td>\n~9.5 mm<\/span><\/td>\n<\/tr>\n
Thermal Responsibility<\/span><\/strong><\/td>\nModule-level (self-contained)<\/span><\/td>\nHost-level (cold plate or system heatsink)<\/span><\/td>\n<\/tr>\n
Cooling Method<\/span><\/strong><\/td>\nAir-cooled<\/span><\/td>\nAir-cooled & liquid-cooled<\/span><\/td>\n<\/tr>\n
Host Compatibility<\/span><\/strong><\/td>\nStandard OSFP cages<\/span><\/td>\nDedicated RHS cages<\/span><\/td>\n<\/tr>\n
Best For<\/span><\/strong><\/td>\nAir-cooled switches, routers<\/span><\/td>\nLiquid-cooled AI servers, high-density racks<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Finned Top (IHS)<\/span><\/strong> \u2014 Integrated Heat Sink modules feature cooling fins built directly into the OSFP connector metal top, with a total module height of approximately 13 mm. Heat is dissipated through host airflow across the integrated fins, making this design ideal for standard air-cooled Ethernet and InfiniBand switches where airflow is predictable and well characterized<\/span>.<\/span><\/p>\n

RHS (Riding Heat Sink)<\/span><\/strong> \u2014 Also known as \u201cFlat Top,\u201d RHS modules deliberately omit the integrated heat sink, presenting a flat metal surface that is only 9.5 mm high. Thermal management shifts to the host platform: a spring-loaded riding heat sink or cold plate mounted above the cage makes direct contact with the module surface when inserted<\/span>. This approach is a key enabler for direct liquid cooling (cold plates) and high-density air-cooled designs where a shared heatsink serves multiple ports<\/span>.<\/span><\/p>\n

Why One Cable Family Covers Every Configuration<\/span><\/h2>\n

The real advantage of the 1.6T OSFP224 DAC portfolio is not just that both thermal designs exist\u2014it is that they work together. The product line is available in three configurations:<\/span><\/p>\n

    \n
  • \n

    OSFP IHS Trunk<\/span><\/strong> \u2014 both ends Finned Top<\/span><\/p>\n<\/li>\n

  • \n

    OSFP RHS Trunk<\/span><\/strong> \u2014 both ends Flat Top<\/span><\/p>\n<\/li>\n

  • \n

    OSFP RHS \u2194 IHS Hybrid<\/span><\/strong> \u2014 one end Finned Top, one end RHS<\/span><\/p>\n<\/li>\n<\/ul>\n

    This hybrid capability is where deployment flexibility becomes a tangible operational benefit. Consider a typical AI cluster deployment: a 1.6T OSFP224 IHS port on an air-cooled switch needs to connect to two 800G OSFP224 RHS ports on a liquid-cooled GPU server. With a hybrid breakout cable, this is a single part number\u2014no adapters, no extra transceivers, no additional fiber management<\/span>.<\/span><\/p>\n

    For network architects, this means:<\/span><\/p>\n

    \n\n\n\n\n\n\n\n
    Scenario<\/span><\/th>\nWithout Hybrid DAC<\/span><\/th>\nWith Hybrid DAC<\/span><\/th>\n<\/tr>\n<\/thead>\n
    Air-cooled switch \u2192 liquid-cooled server<\/span><\/td>\nAdapter + extra module + fiber<\/span><\/td>\nSingle hybrid DAC cable<\/span><\/td>\n<\/tr>\n
    Mixed vendor racks (IHS and RHS cages)<\/span><\/td>\nSeparate SKUs per rack type<\/span><\/td>\nOne SKU covers both<\/span><\/td>\n<\/tr>\n
    Future migration from air to liquid cooling<\/span><\/td>\nReplace entire cabling infrastructure<\/span><\/td>\nReuse cables, swap only host cooling<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    The Real-World Impact: Fewer SKUs, Simpler Inventory<\/span><\/h2>\n

    Data centers rarely deploy a single, uniform cooling architecture. A typical AI data center may house air-cooled top-of-rack switches alongside liquid-cooled GPU servers, with different vendors and generations coexisting in the same facility. Managing separate DAC inventories for IHS-only and RHS-only configurations multiplies SKU count, complicates spare-parts planning, and increases the risk of mis-insertion during maintenance.<\/span><\/p>\n

    A unified 1.6T OSFP224 DAC portfolio solves this by enabling one cable family to serve all thermal configurations. Network operators can standardize on a single product line, reduce spare inventory, and eliminate the \u201cwhich cable goes where\u201d confusion that slows down rack deployments.<\/span><\/p>\n

    Choose Your Configuration, Not Your Vendor<\/span><\/h2>\n

    The 1.6T OSFP224 DAC portfolio delivers:<\/span><\/p>\n

      \n
    • \n

      Full thermal coverage<\/span><\/strong> \u2014 Finned Top for air-cooled switches, RHS for liquid-cooled servers<\/span><\/p>\n<\/li>\n

    • \n

      Hybrid interoperability<\/span><\/strong> \u2014 IHS \u2194 RHS cables for mixed environments<\/span><\/p>\n<\/li>\n

    • \n

      Simplified inventory<\/span><\/strong> \u2014 One DAC family, fewer SKUs<\/span><\/p>\n<\/li>\n

    • \n

      Future-proof migration<\/span><\/strong> \u2014 Reuse cables as cooling architectures evolve<\/span><\/p>\n<\/li>\n<\/ul>\n

      Contact us<\/span><\/strong> to discuss which thermal configuration fits your rack design, or request samples for evaluation.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

      TL;DR: The 1.6T OSFP224 DAC is available in both Finned Top (IHS) and RHS (Riding Heat Sink) designs, with full interoperability between the two. Whether your rack uses air-cooled switches, liquid-cooled AI servers, or a mix of both, one DAC product line covers every thermal scenario\u2014reducing SKU complexity and simplifying inventory management across heterogeneous infrastructure. […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1935,1927,399],"tags":[],"class_list":["post-22656","post","type-post","status-publish","format-standard","hentry","category-1-6t","category-dac","category-data-center"],"yoast_head":"\n1.6T OSFP224 DAC: Finned Top vs. RHS - TARLUZ - FIBER OPTIC SUPPLIERS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tarluz.com\/de\/1-6t\/1-6t-osfp224-dac-finned-top-vs-rhs\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1.6T OSFP224 DAC: Finned Top vs. RHS\" \/>\n<meta property=\"og:description\" content=\"TL;DR: The 1.6T OSFP224 DAC is available in both Finned Top (IHS) and RHS (Riding Heat Sink) designs, with full interoperability between the two. 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